JPH036B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for controlling the height of a so-called one-wheel type rice transplanter with one running wheel to a substantially constant height relative to a field surface. It is something.

[Conventional technology and its problems]

Conventionally, by relating the movement of the float that touches the field to a hydraulic switching valve that raises and lowers the machine (in other words, raises and lowers the wheels), it has been possible to maintain the height of the machine relative to the field at a nearly constant height. However, conventional methods, for example,
As described in Publication No. 55-55030, etc., when there are at least two floats, the movement of the main float is related to the hydraulic switching valve, so the hydraulic switching valve is The switching operation responds sensitively to small irregularities and tilting of the aircraft to the left and right, and as a result of this switching action being performed frequently, the impact associated with the switching action is applied to the aircraft, making it difficult to control the aircraft's height. It was extremely unstable.

Moreover, this tendency for the height control of the machine body to become unstable occurs significantly in so-called single-wheel type rice transplanters that have only one running wheel.

The present invention improves control stability when controlling the height of the machine body in this one-wheel type rice transplanter, and also avoids increasing the size of the rice transplanter due to the height control of the machine body. This is the purpose.

[Means to solve the problem]

In order to achieve this object, the present invention provides a running wheel movable up and down at the rear of the engine disposed on the front upper surface of the fuselage frame, and floats are arranged on both left and right sides of the running wheel. A one-wheel type rice transplanter comprising: a hydraulic cylinder that moves the running wheel up and down; and a hydraulic switching valve that switches the hydraulic cylinder to move the wheel up and down;
A control shaft extending in a direction substantially perpendicular to the traveling direction of the rice transplanter is rotatably supported in a space on the rear side of the engine, and the control shaft and the hydraulic switching valve are connected to each other.
While the hydraulic switching valve is connected to perform switching operations by forward and reverse rotation of the control shaft, a midway portion of a balance shaft extending substantially parallel to the control shaft is rotatably pivoted to a pin shaft protruding backward from the control shaft. and the both ends of the balance shaft and the left and right floats are connected via a link mechanism disposed on the outside of the traveling wheel, so that both ends of the balance shaft move up and down in conjunction with the up and down movement of both floats. The structure was designed to link each component.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates a body frame of a rice transplanter, and the body frame 1 has an engine 2 on the top surface.
The transmission case 3 has a U-shape in plan, consisting of a transmission case 3 to which the transmission case 3 is attached, and a pair of left and right hollow side frames 4 and 5 extending rearward from both left and right ends of the transmission case 3. A swing case 6 extending rearward between both side frames 4 and 5
The front end of the swing case 6 is rotatably pivoted, and one running wheel 7 is provided at the tip of the swing case 6 and is located on the center line in the width direction of the fuselage frame 1. From transmission case 3
The chain inside the swing case 6 (not shown)
Rotationally driven via etc.

Seedling planting cases 8 and 9 are fixed to the rear ends of both side frames 4 and 5, respectively, and the two seedling planting cases 8 and 9 are connected by a gate-shaped connecting frame 10 to form the entire structure. Furthermore, the base end of a lever 11 is rotatably attached to the inner surface of one of the side frames 5 by a pin 12. The tip of the piston rod 16 of the piston 15 in the hydraulic cylinder 14 is pivotally connected to the front end of the side frame 5 by the pin 13, and the tip of the piston rod 16 is pivotally connected by the pin 17.
By connecting the tip of the lever 11 and the arm 18 protruding from the swing case 6 via a link 19, the traveling wheels 7 are moved up and down by the operation of the hydraulic cylinder 14, thereby moving the entire rice transplanter. It is designed to move up and down.

Reference numerals 20 and 21 in the figure indicate a pair of left and right operating handles extending rearward from the seedling planting cases 8 and 9, and the operating handles 20 and 21 are bent in an upwardly inclined shape, On the top surface of the unit, there is a rearward-tilting seedling stand 2 supported movably in the left and right lateral directions by a guide rail 22 and a rail mechanism 23 mounted horizontally between both handles 20 and 21.
4 is provided, and both seedling planting cases 8 and 9 are provided.
On the inner side thereof, swinging seedling planting mechanisms 26 and 27 that reciprocate between the seedling take-out port in the guide rail 22 at the lower end of the seedling platform 24 and the field scene 25 are provided.

Further, reference numerals 28 and 29 in the figure refer to the traveling wheels 7.
The figure shows a pair of left and right floats located on both the left and right sides of the floats 28 and 29, the rear parts of which are attached to the bases of the handles 20 and 21 via the planting depth adjustment mechanism 30, and the front ends of which are attached to both side frames. 4,
5 through links 31 so as to be independently vertically movable.

Further, reference numeral 32 in the figure indicates a rotary type 4-port 3-position hydraulic switching valve attached to the side surface of the transmission case 3, and the engine 2 is connected to the pump port P of the hydraulic switching valve 32 via a circuit 33. Connect a hydraulic pump 34 driven by port A
is connected to the piston rear chamber 15' of the hydraulic cylinder 14 through a circuit 35, and port B is connected to the piston front chamber 15' of the hydraulic cylinder 14 through a circuit 36, so that the spool 37 of the hydraulic switching valve 32 is in the neutral state. When in this position, ports A and B are both closed, ports P and R communicate through the through hole 37', the operation of the hydraulic cylinder 14 is stopped, and the spool 37 is rotated counterclockwise as indicated by arrow a. For example, port P is switched to communicate with port A, port B is switched to communicate with port R, and the piston 15 moves to protrude from inside the hydraulic cylinder 14, thereby lowering the traveling wheels 7, that is, raising the aircraft body. When the spool 37 rotates in the clockwise direction of arrow b, port A is switched to communicate with port R and port B is communicated with port P, and the piston 15 retreats, causing the traveling wheel 7 to rise. It is configured to move, that is, to lower the aircraft.

Further, reference numeral 38 indicates a control shaft disposed in a space on the rear side of the engine 2 so as to extend in a direction substantially perpendicular to the traveling direction of the rice transplanter. The control shaft 38 is rotatably supported by bearings 39 protruding from the upper surface, etc., and a substantially triangular control link 4 is attached to one end of the control shaft 38.
The base end of the control link 40 is rotatably fitted into the control link 40.
and the spool 3 at the hydraulic switching valve 32.
7 and the hydraulic switching valve 32 when the control link 40 is in the position shown by the solid line in FIG.
is in the neutral position, counterclockwise rotation of the control link 40 switches the hydraulic switching valve 32 to raise the aircraft, and clockwise rotation of the control link 40 switches the hydraulic switching valve 32 to lower the aircraft. They are connected via rods 42 as shown in FIG. Further, a pin 43 extending toward the control link 40 in substantially parallel to the axial direction of the control shaft 38 is fixed to the control shaft 38, and the tip of the pin 43 is brought into contact with the back surface of the control link 40. A spring 44 is mounted between the pin 43 and the control link 40 to bias the control link 40 against the pin 43.

On the other hand, base ends of a pair of left and right levers 45 and 46, which are disposed so as to extend rearward on both left and right outer sides of the running wheels 7, are rotatably fitted into both ends of the control shaft 38. The tips of both levers 45, 46,
The pair of left and right floats 28 and 29 are connected via rods 47 and 48, respectively. Further, a pin shaft 49 is provided on the control shaft 38 at a portion between both the levers 45 and 46 and protrudes backward.
The control shaft 38 is rotatably fitted onto the boss 50.
By fixing a balance shaft 51 extending substantially parallel to the levers 45 and 46, and inserting and engaging both ends of the balance shaft 51 into long slot holes 45' and 46' formed in the middle of the levers 45 and 46, respectively. The levers 45, 46 and the rods 47, 48 move both ends of the balance shaft 51 and the left and right floats 28, 29 in conjunction with the vertical movement of the floats 28, 28, so that both ends of the balance shaft 51 move up and down. Link mechanisms 62 and 63 are configured to link each other so as to move. In this case, both link mechanisms 62 and 63, which are constituted by both levers 45 and 46 and both rods 47 and 48, are arranged between the running wheel 7 and both side frames 4 and 5 in plan view. has been done.

Further, reference numeral 52 in the figure is a manual operation rod for manually raising and lowering the aircraft body, and a long slot 53 provided at the tip of the rod slides onto a pin 54 protruding from the side surface of the control link 40. A support bracket 5 attached to the portal frame 10 has a shaft portion 55 that freely engages and is fixed to the proximal end of the manual operating rod 52.
The manual operation rod 52 is slidably inserted into the round hole 57 of No. 6 and has a grip portion 58 at its tip.
is held by a spring 59 provided between the support bracket 56 and the shaft portion 55 such that the pin 54 of the control link 40 is located approximately in the middle of the slotted hole portion 53 when the hydraulic switching valve 32 is in the neutral position. On the other hand, the support bracket 56 is provided with a slot 60 that communicates with the round hole 57, and when the manual operation lever 52 is pulled backward in the direction of arrow c, the hydraulic switching valve 32 is switched to raise the aircraft via the control link 40. In addition, by fitting the constricted portion 61 of the shaft portion 55 into the slot 66 at the rearwardly pulled position, the rearwardly pulled position can be maintained.

In this configuration, the seedlings are supplied onto the seedling stand 24, and when the engine 2 is started, the running wheels 7,
By driving both seedling planting mechanisms 26, 27 and the seedling platform 24, the seedling pine on the seedling platform 24 is divided into individual plants by the vertically swinging seedling planting mechanisms 26, 27 while the rice transplanter is moving forward. After that, the float 28,
After the land has been leveled in step 29, the seeds are planted in two rows in the field 25.

When the plowing depth increases during this rice planting work,
The aircraft descends to approach the field 25, deepening the planting depth in the field 25, but then both floats 28 and 19, which are grounded in the field 25, approach the aircraft and attach rods 47 and 48 to it. Since both levers 45 and 46 simultaneously rotate upward through the levers 45 and 46, the balance shaft 51 whose ends are locked to both levers 45 and 46 does not rotate around the pin shaft 49, and therefore the control shaft having the pin shaft 49 38 rotates counterclockwise, and the control link 40 and the spool 37 of the hydraulic switching valve 32 rotate in the direction of raising the body as indicated by arrow a. At this time, if the rising distance l of both floats 28 and 29 toward the aircraft body is within the valve stroke L required for the spool 37 of the hydraulic switching valve 32 to switch from the neutral position to the aircraft raised position or the aircraft lowered position, the hydraulic switching is performed. valve 32
does not switch to raise the aircraft, but when l exceeds L, the hydraulic switching valve 32 switches to raise the aircraft, hydraulic pressure is sent from port A to the piston rear chamber 15' of the hydraulic cylinder 14, and the traveling wheels 7 move downward. By doing so, the machine rises above the field scene 25, returning to the original planting depth.Also, when the depth of the tiller becomes shallow, the machine rises away from the field scene 25 and returns to the original planting depth. The planting depth of seedlings 25 becomes shallower, but then both floats 28 and 29 that touch the field 25 are separated from the machine body, and both levers 45 and
46 simultaneously rotates downward, the control shaft 3
8. The control link 40 and the hydraulic switching valve 32 will rotate clockwise in the direction of lowering the aircraft, and when the descending distance l of both floats 28 and 29 with respect to the aircraft exceeds the valve stroke L, the hydraulic switching valve 32 will lower the aircraft. position, hydraulic pressure is sent from port B to the piston front chamber 15'' of the hydraulic cylinder 14, and the wheel 7
As the machine moves upward, the machine descends relative to the field, returning the seedlings to the original planting depth, so that the planting depth of the seedlings remains approximately constant as the plowing depth changes. can be automatically controlled.

During the rice planting work, both floats 2
Only the float on one side of the floats 8 and 29, for example, the right float 29, moves up and down depending on the roughness of the field 25, and the right lever 46, which is linked to the right float 29 through a rod 48, moves up and down. When the right lever 46 moves up and down, only about half of the movement is transmitted to the control shaft 38 due to the swinging of the balance shaft 51. In other words, the up and down movement of the right float 29 is transmitted to the control shaft 38 due to the swinging of the balance shaft 51. , 29 move up and down at the same time, the hydraulic switching valve 32 will not raise or lower the aircraft from the neutral position unless the height 2l exceeds approximately twice the rising or descending height l when switching the hydraulic switching valve 32 from the neutral position. Because it does not switch to lowering the aircraft,
Even if the float on one side moves up and down due to relatively small irregularities in the field, the machine will not be raised or lowered accordingly.In other words, the machine will not move up and down finely. Only when the robots 28 and 29 simultaneously move up and down above a certain level, the machine moves up and down accordingly, and the height relative to the field is automatically controlled to a substantially constant value.

In addition, if both the left and right floats 28, 29 move up and down in opposite directions with respect to the direction of movement of the machine during rice transplanting work, both levers 4
5 and 46, the balance shaft 51 only swings about the pin shaft 49 as shown by the dashed line and the dashed double dotted line in FIG. The valve 32 is not switched and the aircraft is not raised or lowered.

When the rice transplanting operation has progressed to the edge of the ridge and the rice transplanter is to be rotated, the seedling planting mechanisms 26 and 27 and the seedling platform 24 are stopped, and the manual operation rod 52 is turned off.
By pulling in the direction of arrow c and fitting and locking the constricted portion 61 of the shaft portion 55 into the slot 60 of the support bracket 56, the control link 40 and the spool 37 of the hydraulic switching valve 32 move in the direction of the arrow a. By rotating clockwise, the hydraulic switching valve 32 switches to raise the aircraft, allowing the aircraft to rise significantly and turn the aircraft. When this turning is completed, the manual operating rod 52 is moved against the support bracket 56. By releasing the lock, the original automatic control is restored and the machine is automatically controlled to a constant height relative to the field.

[Action/effect of the invention]

The present invention is configured as described above, so that
It has the following actions and effects.

When one of the two floats moves up and down, and both floats move up and down in the opposite direction, the height of the aircraft is hardly controlled due to the swing of the balance shaft.
Only when both floats move up and down more than a certain level, the hydraulic switching valve switches from the neutral position to raising or lowering the machine and controlling the height, so it can be adjusted according to small irregularities in the field or the tilt of the machine. The machine body does not move up and down minutely, and the height of the machine body relative to the field surface, that is, the planting depth of seedlings, can be automatically and stably controlled to be approximately constant.

By arranging the control shaft and the balance shaft for controlling the height of the machine body in the space on the rear side of the engine, the engine and running wheels can be separated from each other, which was traditionally a dead space in single-wheel rice transplanters. The space between them can be effectively used for arranging the control shaft and the balance shaft.

In addition, by arranging both link mechanisms that link both ends of the balance shaft and both floats on the outside of the running wheels, when viewed from the side of the rice transplanter,
Since both link mechanisms and the running wheels can be overlapped in the front and back direction of the rice transplanter, this and the conventional dead space can be effectively used for installing the control shaft and the balance shaft as described above. In other words, since the one-wheel rice transplanter is equipped with a control device consisting of a control shaft, a balance shaft, and both link mechanisms, the length and height of the rice transplanter do not increase. Then, it is possible to avoid increasing the size of the rice transplanter when applying the body height control device to the single-wheel rice transplanter.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view of the rice transplanter, FIG. 3 is a perspective view of the lifting device, and FIG. 4 is an enlarged view of the lifting control unit. ,
5 is a cross-sectional view of FIG. 4, FIG. 6 is a cross-sectional view of FIG. 5, FIG. 7 is a cross-sectional view of FIG. 5, and FIG. 8 is a cross-sectional view of FIG. 4. It is. 1...Aircraft frame, 2...Engine, 6...
Swing case, 7... Traveling wheel, 14... Hydraulic cylinder, 28, 29... Float, 32... Hydraulic switching valve, 38... Control shaft, 40... Control link, 42... Rod, 49... Pin Axis, 50...
Boss, 51... Balance shaft, 62, 63... Link mechanism, 45, 46... Lever, 47, 48... Rod.

Claims (1)

[Claims] 1. A single-wheel rice transplanter comprising a single running wheel movable up and down at the rear of an engine disposed on the upper front surface of the body frame, and floats arranged on both left and right sides of the running wheel, as described above. A hydraulic cylinder for raising and lowering the traveling wheels and a hydraulic switching valve for switching the hydraulic cylinder to raise and lower the wheels are provided, and a space on the rear side of the engine is provided in a direction substantially perpendicular to the traveling direction of the rice transplanter. A control shaft extending from the control shaft is rotatably supported, and the control shaft and the hydraulic switching valve are related to each other so that the hydraulic switching valve is operated to switch by forward and reverse rotation of the control shaft. A link mechanism in which a midway portion of a balance shaft extending substantially parallel to the control shaft is rotatably pivoted to a protruding pin shaft, and both ends of the balance shaft and the left and right floats are disposed on the outside of the traveling wheel. 1. A control device for controlling the body height of a single-wheel rice transplanter, characterized in that both ends of a balance shaft are linked to move up and down in conjunction with the up and down movement of both floats.